Allenes stannylcupration

The use of stannylcuprate reagents is well established.112,113 The reactions occur under mild conditions. They are reversible, and the reactivity and regio- and stereo-selectivity are sensitive to the structure and reaction conditions, as illustrated by the reaction of allene with the lower-order cuprate Bu3SnCuCNLi and, more readily, with the higher order cuprate (Bu3Sn)2CuCNLi (Equation (29)).114... 

Regioselective stannylcupration of terminal alkynes and allenes, followed by quenching of the cuprate intermediate with ethylene oxide, provides a facile synthesis of cyclobutene and alkylidine cyclobutane derivatives, respectively (Scheme 3.23) [15c]. A number of total syntheses have exploited regioselective stannylcup-... 

Scheme 3.24. Silylcupration and stannylcupration of allenes under kinetic and thermodynamic control [37c, 67, 95, 96].

Allylstannanes result from stannylcupration of allenes, zinc mediated coupling of allylBr... 

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