Reaction of lithium eneselenolates derived from selenoamides with ketones: a highly diastereoselective synthetic route to β,β-disubstituted β-hydroxy selenoamides
摘要:
The reaction of lithium eneselenolates generated from selenoamides with a variety of ketones proceeded smoothly at -78degreesC to give the corresponding beta,beta-disubstituted beta-hydroxy selenoamides in moderate to good yields. The reaction showed high diastereoselectivity. The products obtained were converted to the corresponding amides by reacting them with cyclohexene oxide. (C) 2003 Elsevier Science Ltd. All rights reserved.
Sequential Addition Reactions of Lithium Acetylides and Grignard Reagents to Selenoiminium Salts Leading to 2-Propynyl Tertiary Amines Bearing a Tetrasubstituted Carbon Center
作者:Toshiaki Murai、Sho Nogawa、Yuichiro Mutoh
DOI:10.1246/bcsj.80.2220
日期:2007.11.15
Selenoiminium salts generated in situ from selenoamides and MeOTf were reacted sequentially with lithium acetylides and Grignardreagents to give 2-propynyl tertiary amines bearing a tetrasubstitut...
Abstract The reaction of lithium eneselenolates and dieneselenolates derived form selenoamides with a variety of carbonyl compounds has been described. In the reaction with α,β-unsaturated esters and ketones Michael addition reaction took place very rapidly, whereas the reaction with α,β-unsaturated aldehydes gave selectively 1,2-adducts. As for the reaction of lithium dieneselenolates ally1 group
Aldol-type condensation reactions of lithium eneselenolates generated from selenoamides with aldehydes
作者:Toshiaki Murai、Akiko Suzuki、Shinzi Kato
DOI:10.1039/b100198l
日期:2001.10.11
Aldol-type condensation reactions of α-monosubstituted selenoamides with a variety of aldehydes are examined to furnish β-hydroxy selenoamides in good to high yields. The use of selenoamides derived from dibenzylamine exhibits high stereoselectivity. As for the reaction with aliphatic aldehydes selenoamides show better yields and selectivity compared with ordinary amides. Conversion of the resulting β-hydroxy selenoamides to 1,3-amino alcohols is also described.
An Efficient Synthetic Method of 4-Penteneselenoamides: Four-Component Coupling Reaction of Terminal Acetylenes, Selenium, Amines, and Allylic Bromides
作者:Toshiaki Murai、Tatsuya Ezaka、Shinzi Kato
DOI:10.1246/bcsj.71.1193
日期:1998.5
The reaction of lithium alkyneselenolates generated from terminal acetylenes, butyllithium, and selenium with amines and allylic bromides proceeded smoothly in THF at 67 °C to give 4-penteneselenoamides in moderate to high yields. The reaction may proceed via selenoketene intermediates bearing an allylic group, followed by the attack of amines to give the products. Aliphatic and aromatic acetylenes
Reaction of lithium eneselenolates derived from selenoamides with ketones: a highly diastereoselective synthetic route to β,β-disubstituted β-hydroxy selenoamides
The reaction of lithium eneselenolates generated from selenoamides with a variety of ketones proceeded smoothly at -78degreesC to give the corresponding beta,beta-disubstituted beta-hydroxy selenoamides in moderate to good yields. The reaction showed high diastereoselectivity. The products obtained were converted to the corresponding amides by reacting them with cyclohexene oxide. (C) 2003 Elsevier Science Ltd. All rights reserved.