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An effective Rh(2)(S-DOSP)(4)-catalyzed asymmetric cyclopentannulation of indolyl rings has been developed. Depending on the substitution pattern of the indole, two distinct regioisomeric products can be generated. These studies demonstrate that rhodium-catalyzed reactions of donor/acceptor carbenoids proceeding by means of zwitterionic intermediates can be carried out with very high asymmetric induction.
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Lian et al. (2009) studied this question.
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