Studies of Azetidin-2-one as a Reactive Enolate Synthon of β-Alanine for Condensations with Aldehydes and Ketones
作者:David R. Williams、Andrew F. Donnell、David C. Kammler、Sarah A. Ward、Levin Taylor
DOI:10.1021/acs.joc.6b01585
日期:2016.11.4
n-2-one (1) and characterization of representative aldol reactions with aldehydes and ketones. Diastereoselectivity features the production of anti-aldol adducts from α,β-unsaturated ketones and α-branched aliphatic aldehydes. The stereoselectivity is rationalized via closed, six-membered transition-state arrangements leading to the formation of Felkin–Anh and anti-Felkin products. Examples illustrate
An Enantiocontrolled Approach for the Synthesis of Chiral 3,5-Disubstituted 2(1H)-pyridinones
作者:David R. Williams、David C. Kammler、William R. F. Goundry
DOI:10.3987/com-05-s(t)70
日期:——
for the convergent synthesis of chiral, nonracemic 5-substituted 3-acyl-2(1H)-pyridinones is reported. Claisen rearrangement provides direct access to the α-branched 2-[4-(tert-butyldimethylsilanoxy)cyclohex-2-enyl]-3-hydroxypropionaldehyde as a key intermediate. The application of mild oxidation conditions facilitates the preparation of a series of 3,5-disubstituted 2(1H)-pyridinones.