Practical and reliable synthesis of dialkyl N-arylphosphoramidates with nitroarenes as substrates
摘要:
A new single-step transformation of readily available nitroarenes with trialkyl phosphites, which can be performed both under thermal and microwave conditions, delivers dialkyl N-arylphosphoramidates in good yields and short reaction times. (C) 2009 Elsevier Ltd. All rights reserved.
作者:Christopher J. Moody、Charles W. Rees、Robert Thomas
DOI:10.1016/s0040-4020(01)88497-0
日期:1992.1
A short synthesis of the pentacyclic marine alkaloid ascididemin 1 (four steps, 21% yield) from 1,10-phenanthroline 16 is described. The key step, photocyclisation of the quinoneimine 14 in sulphuric acid, is the first such aza stilbene photocyclisation of a quinoneimine. Intermediate 14 is prepared in a single, but low yielding, step from the quinone 4 in an aza Wadsworth-Emmons reaction, or in much better yield from the epoxide 17 by treatment with 2-iodoaniline and triethylaluminium, followed by oxidation with barium manganate.