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Journal of the American Chemical Society, Vol.116, No.1, 1-5, 1994
Stereospecific Palladium Copper Cocatalyzed Cross-Coupling of Alpha-Alkoxystannes and Alpha-Aminostannanes with Acyl Chlorides
Stille-type cross-coupling between alpha-alkoxy(amino)stannanes and acyl chlorides affords alpha-hetero-substituted ketones in moderate to good yields when cocatalyzed by Pd and Cu(I) salts. The reaction is applicable to a wide range of tin compounds, especially those bearing alpha-electron-withdrawing groups such as benzoyloxy or acetyloxy, although some ethers (e.g., MOM) are also satisfactory. Aromatic acid chlorides give the best yields. Coupling of chiral alpha-alkoxystannanes, readily available by BINAL-H asymmetric reduction of acylstannanes, proceeds with retention of configuration.
Keywords:ENANTIOSELECTIVE SYNTHESIS;ORGANOTIN REAGENTS;ACID-CHLORIDES;2;2-DIFLUOROVINYLBORANES;TRANSMETALATION;EQUIVALENTS;CARBANIONS;STANNANES;UTILITY