Synthesis 2007(2): 320-326  
DOI: 10.1055/s-2006-958940
PSP
© Georg Thieme Verlag Stuttgart · New York

Molybdenum-Catalyzed Synthesis of Stannylated Allylic Alcohol Derivatives and Their Synthetic Applications

Uli Kazmaier*, Sandra Dörrenbächer, Alexander Wesquet, Simon Lucas, Manuela Kummeter
Institut für Organische Chemie, Universität des Saarlandes, 66123 Saarbrücken, Germany
Fax: +49(681)3022409; e-Mail: u.kazmaier@mx.uni-saarland.de;
Further Information

Publication History

Received 5 September 2006
Publication Date:
14 December 2006 (online)

Abstract

Mo(CO)3(CNt-Bu)3 (MoBI3) was found to be a suitable catalyst for the regioselective hydrostannation of several types of alkynes, especially propargyl alcohol derivatives, affording preferentially the α-stannylated products. If propargylic acetates are used, the stannylated allylic acetates produced are suitable substrates for Pd-catalyzed allylic alkylations. Allenyl carbinols also undergo regioselective hydrostannation in the presence of MoBI3, because the allenyl carbinols are more reactive than alkynes, and therefore milder reaction conditions are possible. Allylstannanes are formed preferentially, which can easily be converted into allyl iodides or vinyl epoxides.

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In this case, the slow addition mode gave no significant improvement.