A TBAF-mediated Chemoselective Method for Synthesis of 4-Methylbutenolides and 4-Hydroxy-4-methylbutenolides from 3-Hydroxy-4-(tert-butyldimethylsilyloxy)pentanoates
BF<sub>3</sub>·Et<sub>2</sub>O-Mediated annulation of α-keto acids with aliphatic ketones for the synthesis of γ-hydroxy-butenolides and γ-alkylidene-butenolides
Annulation reaction of α-keto acids with cyclic or acyclic aliphatic ketones is reported herein to divergently access γ-hydroxy-butenolides and γ-alkylidene-butenolides depending on the amount of BF3·Et2O. This protocol features good functional tolerance and ease of operation, to open a route to access butenolides via an annulation and dehydration process.
本文报道了 α-酮酸与环状或非环状脂肪族酮的环化反应,根据 BF 3 ·Et 2 O 的量不同地获得 γ-羟基-丁烯内酯和 γ-亚烷基-丁烯内酯。该协议具有良好的功能耐受性和易用性操作,开辟一条通过环化和脱水过程获得丁烯内酯的途径。
ALPER H.; CURRIE J. K.; ABBAYES H. DES, J. CHEM. SOC. CHEM. COMM., 1978, NO 7, 311-312