Regioselective Alkylation of the Polyfunctional Nucleophile 1-(Methylthio)-3-triethylsilyloxypentadienyllithium
作者:Wolfgang Oppolzer、Roger L. Snowden、Paul H. Briner
DOI:10.1002/hlca.19810640706
日期:1981.11.4
γ-Selective sulfenylation of the triethysilyloxypentadienyllithium 1 gave the versatile alkylthiodene 4 which on successive deprotonation and alkylation furnished with high regioselectivity the γ-products 6. Fluoride-promoted silylether cleavage 6 7 may be followed by intramolecular [4 + 2]-addition 7c 8 and sulfoxide elimination 8 9. The conversions 7b 12 and 7a 17 demonstrate the feasibility of 5
三乙基甲硅烷基氧基戊二烯基锂1的γ选择性亚磺酰基化反应生成了多用途的烷基硫二烯4,它在连续的去质子化和烷基化中具有较高的区域选择性,从而生成了γ产物6。氟化物促进的甲硅烷基醚裂解6 7之后,可以进行分子内[4 + 2]加成7c 8和亚砜消除8 9。转化7b 12和7a 17证明了5可以用作假设的β-去质子化的二乙烯基酮13的等价物。 其两个烯酮单元可以分别进行屏蔽。