中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (3aS,5R,6S,7S,7aS)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-2-pent-4-enyloxy-2-phenyl-tetrahydro-[1,3]dioxolo[4,5-b]pyran-6,7-diol | 870101-07-8 | C34H42O7Si | 590.789 |
—— | 3,4,6-tri-O-benzoyl-β-D-mannopyranose 1,2-(pent-4-enyl orthobenzoate) | 123487-55-8 | C39H36O10 | 664.709 |
—— | (3aS,5R,6S,7S,7aS)-5-(hydroxymethyl)-2-pent-4-enoxy-2-phenyl-5,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-b]pyran-6,7-diol | 163039-18-7 | C18H24O7 | 352.384 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | tert-butyl-[[(2R,3R,4S,5S,6S)-6-pent-4-enoxy-3,4,5-tris(phenylmethoxy)oxan-2-yl]methoxy]-diphenylsilane | 273934-59-1 | C48H56O6Si | 757.055 |
—— | pent-4-enyl 2-O-(3,4-di-O-benzyl-6-O-(tert-butyldiphenylsilyl)-α-D-mannopyranosyl)-3,4,6-tri-O-benzyl-α-D-mannopyranoside | 150772-63-7 | C68H78O11Si | 1099.45 |
—— | pent-4-enyl 2-O-benzoyl-3,4-di-O-benzyl-6-O-tert-butyldiphenylsilyl-3,4-di-O-benzyl-α-D-mannopyranoside | 470475-30-0 | C48H54O7Si | 771.038 |
Lemieux's extensive work on replacement reactions at the anomeric center helped to establish the fact that the O-2-protecting group of a donor exerts powerful control over stereoselectivity in glycoside coupling reactions. This manuscript shows that the O-2-protecting group of a donor also exerts powerful, indeed sometimes total, control over regioselectivity in glycosidation of diols. The latter acceptors also exhibit preferences over the donor, thereby providing evidence for the concept of reciprocal donor acceptor selectivity (RDAS). The latter concept is put to the test by simultaneously presenting an acceptor diol with equivalent amounts of two donors, in the hope of achieving double differential glycosidation leading to one-pot assembly of a trisaccharide. When the pair of donors did not conform to RDAS principles the reaction did not proceed beyond a dissacharide. However, when the pair was RDAS sanctioned, a single trisaccharide (out of four possibilities) was obtained.Key words: regiocontrolled glycosidation, armed and disarmed donors, di- and trioxolenium ions, oxocarbenium ion.
The C1 and C2 stereocenters of α‐glucosaminides can be prepared by establishing the stereocenters in either order. For the former, a C2‐azido glucosyl donor is prepared first, and the restraining effect of a 4,6‐O‐benzylidene ring is used to induce α‐coupling. For the latter, the C1 linkage is prepared first by use of an