Photoaddition of N-acylbenzoxazole-2-thiones to alkenes
作者:Takehiko Nishio
DOI:10.1039/a800281i
日期:——
N-Acylbenzoxazole-2-thiones 1 undergo photoaddition with alkenes 2 in a regiospecific manner to yield benzoxazole derivatives 3–9 and/or the unexpected, iminothietanes 10–14 via spirocyclic aminothietane intermediates, depending on the nature of the substituents both on the N-atom of 1 and those present in the alkenes 2.
Photochemical reactions of N-acylbenzoxazole-2-thiones
作者:Takehiko Nishio、Ikuo Iida、Kunio Sugiyama
DOI:10.1039/b002548h
日期:——
presence of a variety of alkenes 2 yields 2-substituted benzoxazoles 3–20 and/or the unexpected products, iminothietanes 21–29 by intramoleculartrapping of the acyl group by thiolate anion of the zwitterionicintermediate I and by the phenolate anion of the zwitterionicintermediate II, respectively, derived from the spirocyclic aminothietanes AT which are formed by regioselective [2+2] cycloaddition of