A new “5+1” route to arenes. Application to the facile synthesis of D4-symmetric chiral porphyrins
作者:John Barry、Thomas Kodadek
DOI:10.1016/s0040-4039(00)77145-0
日期:1994.4
A new synthesis of D4-symmetric porphyrins is presented which provides chiral macrocycles in only five steps starting from optically active cyclic ketones. The efficacy of this approach is demonstrated with the synthesis of a new porphyrin derived from R-(+)-nopinone. The development of this flexible and general route should speed the development of porphyrin-based asymmetric catalysts.
Synthesis and catalytic epoxidation activity of terpene-derived D4-symmetric metalloporphyrins
作者:John F. Barry、Lara Campbell、Dudley W. Smith、Thomas Kodadek
DOI:10.1016/s0040-4020(97)00470-5
日期:1997.6
We report here a flexible synthesis of chiral, D4-symmetric porphyrins from cyclic ketone starting materials. Two porphyrins have been synthesized from the terpene 1-R-(+)-nopinone, obviating the need to perform a resolution. The chloromanganese derivative of one of these porphyrins is a good catalyst for the epoxidation of terminal alkenes, providing epoxides with e.e.'s of 70% with high turnover