New Methods for Stereoselective Synthesis of α-Alkylidene-γ-butyrolactones Using Monoanion of<i>O</i>-Ethyl<i>S</i>-(Tetrahydro-2-oxo-3-furanyl) Thiocarbonate and Dianion of α-Mercapto-γ-butyrolactone
作者:Kazuhiko Tanaka、Hideki Uneme、Nobuyuki Yamagishi、Rikuhei Tanikaga、Aritsune Kaji
DOI:10.1246/bcsj.53.2910
日期:1980.10
The lithium enolates of O-ethyl S-(tetrahydro-2-oxo-3-furanyl) dithiocarbonate and thiocarbonate were found to be efficient reagents for the stereoselective synthesis of α-alkylidene-γ-butyrolactones from carbonyl compounds. The dianion of α-mercapto-γ-butyrolactone was successfully generated by treatment of α-mercapto-γ-butyrolactone with 2.2 equivalents of lithium diisopropylamide in the presence
发现 O-乙基 S-(四氢-2-氧代-3-呋喃基)二硫代碳酸酯和硫代碳酸酯的锂烯醇化物是从羰基化合物立体选择性合成 α-亚烷基-γ-丁内酯的有效试剂。α-巯基-γ-丁内酯的二价阴离子是在-78°C、N,N,N',N'-四甲基乙二胺存在下,用2.2当量的二异丙基氨基锂处理α-巯基-γ-丁内酯而成功生成的。四氢呋喃。由此形成的二价阴离子已被用于从羰基化合物有效和立体选择性地合成 α-亚烷基-γ-丁内酯。