Reaction of Magnesium Alkylidene Carbenoids with Lithium .ALPHA.-Sulfonyl Carbanions: A Novel Synthesis of Tri- and Tetra-substituted Allenes from 1-Chlorovinyl p-Tolyl Sulfoxides and Sulfones
作者:Tsuyoshi Satoh、Tatsuya Sakamoto、Masanori Watanabe、Koji Takano
DOI:10.1248/cpb.51.966
日期:——
below -78 degrees C gave magnesium alkylidene carbenoids in about 90% yields. The reaction of the generated carbenoids with lithium alpha-sulfonyl carbanions was found to afford tri- and tetra-substituted allenes. Both cyclic ketones and acyclic ketones were useful in this procedure. However, the 1-chlorovinyl p-tolyl sulfoxides derived from aldehydes gave only rearranged products, acetylenes, under the
在-78℃以下用乙基氯化镁或异丙基氯化镁处理由酮和氯甲基对甲苯基亚砜合成的1-氯乙烯基对甲苯基亚砜,以约90%的收率得到亚烷基镁类胡萝卜素。发现生成的类胡萝卜素与α-磺酰基锂碳负离子的反应得到三和四取代的烯丙基。环状酮和非环状酮都可用于该程序。然而,在反应条件下,衍生自醛的1-氯乙烯基对甲苯基亚砜仅产生重排的产物乙炔。用1-萘基苯基砜的α-碳环锂处理衍生自旋光性1-氯乙烯基对甲苯基亚砜的亚烷基碳酸镁。然而,发现所获得的异戊烯是外消旋的。