Thermal elimination of carbonyl sulfide from O-aryl thionocarbonates of pyrrolidine-, piperidine-, and tetrahydrothiophene-2-ethanol.
作者:Satomi SAKANOUE、Shinya HARASAWA、Naoki YAMAZAKI、Ryuji YONEDA、Takushi KURIHARA
DOI:10.1248/cpb.38.2981
日期:——
Pyrolysis of O-2-(1-benzyl-2-pyrrolidinyl and 2-piperidyl)ethyl O-phenyl thionocarbonates (4 and 25) in acetonitrile gave 1-benzyl-4-phenoxyhexahydro-1H-azepine (7) and 1-benzyl-4-phenoxyoctahydroazocine (26) with liberation of COS in 55% and 32% yields, accompanied with 2-(2-phenoxyethyl)pyrrolidine and piperidine (8 and 27), via the azetidinum intermediate (6). On the other hand, O-phenyl O-2-(2-tetrahydrothienyl)ethyl thionocarbonate (32) resulted in the predominant formation of the O, S-rearrangement product (35) in 53% yield.
O-2-(1-苄基-2-吡咯烷基和2-哌啶基)乙基 O-苯基硫代碳酸酯(4和25)在丙酮中进行热解,分别以55%和32%的产率生成1-苄基-4-苯氧基六氢-1H-氮杂卓(7)和1-苄基-4-苯氧基八氢氮杂环庚烯(26),同时释放COS,并伴随生成2-(2-苯氧基乙基)吡咯烷和哌啶(8和27),这些是通过氮杂环丁烷中间体(6)进行的。另一方面,O-苯基 O-2-(2-四氢噻吩基)乙基硫代碳酸酯(32)主要生成O,S重排产物(35),产率为53%。