Polymer-supported chiral molybdenum catalyst

More complex heterocyclic structures have been synthesized efficiently and with high stereoselectivities using tandem AROM-RCM sequences [85] similarly, application of tandem AROM/CM to functionalized norbomenes affords enantio-pure highly functionalized cydopentanes [86]. A polymer-supported chiral molybdenum catalyst for enantioselective metathesis effidendy promotes ARCM (kinetic resolution as well as desymmetrization) and AROM reactions and can be recycled [87]. 

Hoveyda and Schrock attached (97a) to polymer via attached styrene groups yielding the first reported supported chiral molybdenum olefin metathesis catalyst, (290) (Scheme 27). Supported complex (290) is less active than (97a), but it gives similar ranges of ees for enantioselective transformations like desymmetrization. The catalyst is recyclable and, even though the conversions have eroded, the enantioselectivity is still relatively high. Table 14. 

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