A Novel Glycosylation Reaction of 2-Amino-2-deoxy-D-glucopyranose Using Dimethylphosphinothioate
作者:Toshiyuki Inazu、Takashi Yamanoi
DOI:10.1246/cl.1989.69
日期:1989.1
β-Glucosides were stereoselectively obtained in good yields from 3,4,6-tri-O-benzyl-2-benzyloxycarbonylamino-2-deoxy-α-d-glucopyranosyl dimethylphosphinothioate with several alcohols in the presence of iodine and a catalytic amount of trityl or perchlorate salts.
Catalytic Stereoselective Synthesis of 2-Amino-2-Deoxy-α-D-Glucopyranosides and Galactopyranosides
作者:Koki Matsubara、Teruaki Mukaiyama
DOI:10.1246/cl.1993.2145
日期:1993.12
In the presence of a catalyst generated from SnCl4 and a silver salt, various 2-amino-2-deoxy-α-D-glucopyranosides or galactopyranosides are stereoselectively synthesized in good yields with high stereoselectivities through anomerization step starting from 1,3,4,6-tetra-O-acetyl-2-deoxy-2-(2,2,2-trichloroethoxycarbonylamino)-β-D-glucopyranose or galactopyranose and alkyl trimethylsilyl ethers, respectively.
In the presence of catalytic amounts of [1,2-benzenediolato(2-)-O,O′]oxotitanium and trimethylsilyl triflate, 1-O-trimethylsilyl-2,3,5-tri-O-benzyl-D-arabinofuranose stereoselectively reacts with various trimethylsilyl ethers to afford the corresponding 1,2-cis-arabinofuranosides in high yields.
In the presence of a catalytic amount of active acidic species generated from SnCl4 and AgClO4, various α-glucosides are stereoselectively synthesized in excellent yields from 1-O-2′-(2′-methoxyethoxy)acetyl-2,3,4,6-tetra-O-benzyl-D-glucopyranose and alkyl trimethylsilyl ethers. β-Glucosides are also selectively prepared by using a catalyst, generated from SiCl4 and AgClO4 in the above reaction.
In the presence of a catalytic amount of tin(IV) species generated from tin(IV) chloride and silver perchlorate, 1-O-acetyl-d-glucose stereoselectively reacts with silyl alkoxides to give the corresponding α-glucosides in high yields.