Abstract
Commercially available molybdenum(VI) oxides such as (NH 4) 2MoO 4, (NH 4) 6Mo 7O 24·4H 2O, MoO 2(acac) 2, and MoO 2(TMHD) 2 are highly effective dehydrative cyclization catalysts for the synthesis of a variety of oxazolines. The reaction proceeds with a complete retention of configuration at the β-position. For the dehydrative cyclization of cysteine derivatives, bis(2-ethyl-8-quinolinolato)dioxomolybdenum(VI) shows remarkable catalytic activity and gives thiazolines without a significant loss of stereochemical integrity at the C2-exomethine positions.
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