Carbon-branched carbohydrate chirons: practical access to both enantiomers of 2-C-methyl-ribono-1,4-lactone and 2-C-methyl-arabinonolactone
摘要:
Readily crystallized 2-C-methyl-D-ribono-1,4-lactone is formed in a one-pot procedure from D-glucose without any protecting groups by treatment with dimethylamine to give an Amadori ketose and then with aqueous calcium hydroxide in yields of approximately 25%; 2-C-methyl-L-ribono-1,4-lactone is similarly produced from L-glucose. 3,4-O-Isopropylidene-2-C-methyl-D-arabinono-1,5-lactone and 2-C-methyl-D-arabinono-1,4-lactone were prepared in a combined 60% yield by the Kiliani reaction of sodium cyanide with a protected 1-deoxy-D-ribulose derived from D-erythronolactone; the enantiomeric arabinonolactones are similarly available from L-erythronolactone. (C) 2008 Elsevier Ltd. All rights reserved.
Compounds containing oxazolidinone moiety and uses thereof
申请人:——
公开号:US20040039209A1
公开(公告)日:2004-02-26
A compound and method for producing an enantiomerically enriched epoxide from an olefin using a chiral ketone and an oxidizing agent is disclosed. In particular, the compound is of the formula: I wherein R
1
, R
2
, R
3
and R
4
are those defined herein.