Expansive Rearrangement of<i>N</i>-Vinylthiazolidines to 2,3,4,7-Tetrahydro-1,4-thiazepines and their Transformation in 3-Thia-6-azabicyclo[3.2.1]oct-6-enes
作者:Alfonso González-Ortega、Luis Calvo、Mónica Pérez、María Carmen Sañudo
DOI:10.1055/s-2004-836069
日期:——
3-(2-Cyano-1-methylvinyl)-N-methoxy-N-methylthiazolidine-4-carboxamide was transformed in 1H,3H-pyrrolo[1,2-c]thiazoles by means of a modified Knorr synthesis or in 6-cyano-N-methoxy-N,5-dimethyl-2,3,4,7-tetrahydro-1,4-thiazepine-3-carboxamide by simple thermal treatment. The latter led to 8-hydroxy-3-thia-6-azabicyclo[3.2.1]oct-6-ene-1-carbonitrile derivatives when it reacted with Grignard or organolithium compounds.
通过改良的克诺尔合成法,3-(2-氰基-1-甲基乙烯基)-N-甲氧基-N-甲基噻唑烷-4-甲酰胺被转化为 1H,3H-吡咯并[1,2-c]噻唑,或通过简单的热处理被转化为 6-氰基-N-甲氧基-N,5-二甲基-2,3,4,7-四氢-1,4-硫氮杂卓-3-甲酰胺。后者与格氏化合物或有机锂化合物反应后,可生成 8-羟基-3-硫杂-6-氮杂双环[3.2.1]辛-6-烯-1-甲腈衍生物。