BENZOTHIADIPHOSPHOLE AS PHOSPHORUS DONATING REAGENT FOR A NEW ROUTE TO 2H-1,2,3-DIAZAPHOSPHOLE DERIVATIVES

摘要

Conjugated azoalkenes 2 react at reflux toluene with fused benzothiadiphosphole 1 (or 4) to give the diazaphosphole 3 in 25-52% yields. With this route it is possible to isolate the so far unknown 3a which is difficult to obtain in other reported conditions. The P atom involved in this cycloaddition is the one between the two S atoms. [References: 26]