Stereoselective Allylation of Acetals through Intramolecular Transfer of an Allylsilane
摘要:
[GRAPHICS]Through a cyclic transition state of tetravalent silicon intermediate, the reaction of allylsilyl acetal in the presence of TiCl4 proceeded in a stereoselective manner. Highly diastereoselective allylation of lactols could be performed in two steps. On the other hand, Me3SiOTf-mediated reaction of allylsilyl acetal provided homoallyl methyl ether without stereoselectivity.
[GRAPHICS]Through a cyclic transition state of tetravalent silicon intermediate, the reaction of allylsilyl acetal in the presence of TiCl4 proceeded in a stereoselective manner. Highly diastereoselective allylation of lactols could be performed in two steps. On the other hand, Me3SiOTf-mediated reaction of allylsilyl acetal provided homoallyl methyl ether without stereoselectivity.