Preparation of Allyl Sulfoxides by Palladium-Catalyzed Allylic Alkylation of Sulfenate Anions
作者:Guillaume Maitro、Guillaume Prestat、David Madec、Giovanni Poli
DOI:10.1021/jo061359u
日期:2006.9.1
Palladium-catalyzed allylic alkylation of sulfenate anions, generated from β-sulfinylesters by retro-Michael reaction, can take place under biphasic conditions. This new reaction provides a simple, mild, and efficient route to allyl sulfoxides in good yields.
Nickel catalyzed asymmetric synthesis of dienyl sulfoxides were accomplished with up to 98 % ee from both racemic allenyl carbonates and β-sulfinyl esters employing cheap Ni(II) as precatalyst. Experimental and computational methods revealed an interesting associated outersphere mechanism which is uncommon in transition metal catalyzed asymmetric allylic nucleophilic substitution reactions.