Regioselective construction of polysubstituted phenols from Baylis–Hillman adducts via formal [4+2] annulation strategy
摘要:
Polysubstituted phenol derivatives were synthesized regioselectively starting from the Baylis-Hillman adducts via the formal [4+2] annulation protocol as the key step. (c) 2006 Elsevier Ltd. All rights reserved.
Through the cleavage of the CCbond, the first catalytictandemconjugateaddition–eliminationreaction of Morita–Baylis–HillmanCadducts has been presented. Various SN2′‐like C‐, S‐, and P‐allylic compounds could be obtained with exclusive E configuration in good to excellent yields. The Michael product could also be easily prepared by tuning the β‐C‐substituent group of the α‐methylene ester under
通过CC键的裂解,提出了Morita-Baylis-Hillman C加合物的第一个催化串联共轭加成-消除反应。可以通过独家E 构型获得各种S N 2'-样C-,S-和P-烯丙基化合物,并具有良好或优异的收率。在相同的反应条件下,通过调节α-亚甲基酯的β-C-取代基也可以很容易地制备迈克尔产物。通过DFT方法计算的各种跃迁状态的相对能量有力地支持了所观察到的化学选择性和非对映选择性。
Applications of Baylis–Hillman acetates: one-pot, facile and convenient synthesis of substituted γ-lactams
作者:Deevi Basavaiah、Jamjanam Srivardhana Rao
DOI:10.1016/j.tetlet.2003.12.133
日期:2004.2
A simple, convenient and one-pot transformation of the acetates of Baylis–Hillman adducts into substituted γ-lactams, that is, (E)-5-alkyl-3-arylidenepyrrolidin-2-ones via treatment with nitroalkanes in the presence of a base, followed by reductive cyclization, using Fe/AcOH, is described.