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Preparation of functionalized zinc borates and their coupling reaction with allylic acetates

✍ Scribed by Yuichi Kobayashi; Yuko Tokoro; Kengo Watatani

Publisher
Elsevier Science
Year
1998
Tongue
French
Weight
202 KB
Volume
39
Category
Article
ISSN
0040-4039

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✦ Synopsis

Several methods were examined to prepare functionalized boronate esters 4a~g. Thus, reaction of the lithium anions with B(O-i-Pr) 3 followed by esterification with 2,3-butanediol afforded 4a,b,d,e. The Masamune-Winig reaction was applied to the boronate ester 4a to expand the carbon chain giving 4e and 4f. The alkenyl boronate ester 4g was prepared from acetylene 10 by hydroboration using (Ipc)2BH followed by the ligand exchange reaction.

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