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HONGKUN / PRODUCT DIRECTORY

1-(1-Ethoxyethyl)-1H-pyrazole-4-boronic acid pinacol ester | CAS 1029716-44-6

A pyrazole-4-boronate carrying an N-(1-ethoxyethyl) protecting group, used as a protected precursor in published JAK-inhibitor intermediate chemistry where N-protection and the pinacol boronate must be distinguished analytically.

CAS1029716-44-6
Molecular formulaC13H23BN2O3

Product overview

Two different functional elements define this building block: a pinacol boronate at pyrazole C4 and a 1-ethoxyethyl group attached to a ring nitrogen. The N-substituent is a protecting group, so the compound is distinct from the corresponding N–H pyrazole boronate. In published process chemistry, removal of that protecting group provides the unprotected pyrazole-4-boronic acid pinacol ester for subsequent intermediate construction. The product name can also be written using the full tetramethyldioxaborolane ring description. Qualification should connect the shortened name to CAS 1029716-44-6 and confirm both the N-protection state and the boronate ester. These distinctions are more useful than treating all pyrazole boron reagents as interchangeable.

Chemical identity

Chemical name
1-(1-Ethoxyethyl)-1H-pyrazole-4-boronic acid pinacol ester
CAS number
1029716-44-6
Molecular formula
C13H23BN2O3

Application context

A published JAK-inhibitor process includes this material as an N-protected precursor to the N–H pyrazole-4-boronate. The route removes the ethoxyethyl group while retaining the pinacol boronate, preparing the pyrazole component used in downstream heteroaromatic intermediate chemistry. This makes the product relevant when a route specifically calls for the protected stage. A purchase intended for the unprotected coupling reagent should instead identify that separate compound. For process transfer or supplier qualification, review whether the proposed analytical method resolves the protected material, its N-deprotected counterpart and relevant related components. The fraction of each form affects the composition entering the next stage. Residual-solvent and water requirements should follow the receiving process, with sample evaluation focused on the planned deprotection or other defined transformation.

Chemistry and synthetic role

The pinacol ester occupies C4 of the pyrazole; the 1-ethoxyethyl substituent masks the N–H position. They perform different roles and require separate identity checks.

Quality review

Verify N-protection

Use structural data and chromatography to distinguish the ethoxyethyl-protected compound from the N–H pyrazole boronate.

Confirm the pinacol boronate

Check the requested ester form rather than accepting a boronic acid or a different boronate based only on a shortened name.

Track route-related components

Agree limits for relevant precursor and deprotected species, with water and solvent data suited to the intended next step.

Preparing a specification

Specify CAS 1029716-44-6, N-(1-ethoxyethyl) protection and the pinacol ester. State assay basis and method, limits for the N-deprotected counterpart and other agreed related substances, plus process-specific water and solvent requirements.

Packaging and storage

Confirm pack size and closure for the selected grade. Storage and transport conditions should follow the actual supplier SDS and stability information available for that material.

Documentation

Request lot COA, NMR or equivalent identity data and a chromatogram resolving the protection-state variants. Confirm whether residual-solvent and water results are available for the proposed lot.

Procurement questions

Is this the N–H pyrazole-4-boronate?

No. The ring nitrogen carries a 1-ethoxyethyl protecting group. Specify the protection state explicitly.

What does the long dioxaborolane name mean?

It describes the pinacol boronate ester attached at pyrazole C4.

Why review the deprotected counterpart?

Its presence changes the proportion of protected material entering a route designed around the N-protected stage.

Technical sources
  1. PubChem CAS-resolved identity, CID 46736798NCBI / National Library of Medicine
  2. Protected pyrazole boronate ADE001296Sigma-Aldrich
  3. US20140256941A1 — Processes and intermediates for making a JAK inhibitorIncyte / USPTO