Convenient and efficient procedures for thiirans have been developed via a one-pot reaction of benzoxazolyl β-ketosulfides with NaBH4 and NaOH in MeOH and THF. The reaction is considered to proceed via the spiro intermediate by the ipso-addition of β-hydroxygroup, which is formed by the NaBH4 reduction of β-keto group, to 2-position of benzoxazole group.
Iodine as a mild, efficient, and cost-effective catalyst for the synthesis of thiiranes from oxiranes
作者:Jhillu S. Yadav、Basi V. Subba Reddy、Sandip Sengupta、Manoj K. Gupta、Gakul Baishya、Sukkala J. Harshavardhana、Uttam Dash
DOI:10.1007/s00706-008-0925-1
日期:2008.11
We developed an efficient protocol for the synthesis of thiiranesfromoxiranes using a catalytic amount of molecular iodine. The notable features of this procedure are mild reaction conditions, high conversions, short reaction times, economic viability of the reagents, compatibility with various functionalities, and simple experimental/product isolation procedures which make it a useful and attractive