Efficient preparation of 3-substituted-furan-2(5H)-ones and their direct vinylogous aldol addition
作者:Marco Bella、Giovanni Piancatelli、Antonella Squarcia
DOI:10.1016/s0040-4020(01)00331-3
日期:2001.5
The deprotonation of 3-substituted-furan-2(5H)-ones 1, obtained via the hydrolysis of 3-substituted-2,5-dihydro-2,5-dimethoxyfurans, affords in the reaction with both aromatic and aliphatic aldehydes regioselectively the unsaturated 3-substituted 5-(1′-hydroxy)-γ-butyrolactones, such as 4, 5, 6, 7, 8, 9 and 10. The use of Lewis acids allows modulation of the diastereoisomeric ratios. The subsequent
通过3-取代的2,5-二氢-2,5-二甲氧基呋喃的水解反应获得的3-取代的呋喃-2(5 H)-ones 1的去质子化可选择性地与芳族和脂族醛进行反应不饱和的3-取代的-5-(1'-羟基) - γ丁内酯,如4,5,6,7,8,9和10。路易斯酸的使用允许非对映异构体比例的调节。随后用硼化镍进行的还原导致形成相应的饱和5-(1'-羟基)-γ-丁内酯,例如11,12和13。