Selectivity Switch in the Catalytic Functionalization of Nonprotected Carbohydrates: Selective Synthesis in the Presence of Anomeric and Structurally Similar Carbohydrates under Mild Conditions
作者:Wataru Muramatsu、Yuki Takemoto
DOI:10.1021/jo3024279
日期:2013.3.15
A catalytic process for the chemo- and regioselective functionalization of nonprotected carbohydrates has been developed. This novel process allows selective thiocarbonylation, acylation, and sulfonylation of a particular hydroxy group in a particular carbohydrate in the simultaneous presence of structurally similar carbohydrates such as anomers. In addition, the chemoselectivity can be switched by regulating only the length of the alkyl chain in the organotin catalyst.
Organotin‐Catalyzed Highly Regioselective Thiocarbonylation of Nonprotected Carbohydrates and Synthesis of Deoxy Carbohydrates in a Minimum Number of Steps
Nonprotectedcarbohydrates: The catalytic regioselectivethiocarbonylation of carbohydrates by using organotin dichloride under mild conditions was demonstrated. The reaction afforded various deoxy saccharides in high yields and excellent regioselectivity in a minimumnumber of steps. The regioselectivity of the thiocarbonylation is attributed to the intrinsic character of the carbohydrates based on