发明名称 |
FREMGANGSMAADE TIL FREMSTILLING AF GAMMA-PYRONER |
摘要 |
Prepn. of a gamma pyrole of formula (I) comprises heating a 4-halo-dihydropyran of formula (II) or an 6,6'-oxy-bis 4-halo-2H-pyran-3(6H)-one of formula (V) in an aq. acid soln. until hydrolysis is practically complete. (where R is H, 1-4C alkyl, phenyl or benzyl; R' is H, 1-4C alkyl or -COR" where R" is methyl, ethyl or phenyl; R'" is H or 1-4C alkyl and X is Cl or Br). |
申请公布号 |
DK153484(B) |
申请公布日期 |
1988.07.18 |
申请号 |
DK19860003259 |
申请日期 |
1986.07.09 |
申请人 |
PFIZER INC. |
发明人 |
BRENNAN, THOMAS MOTT;BRANNEGAN, DANIEL PATRICK;WEEKS, PAUL DOUGLAS;KUHLA, DONALD ERNEST |
分类号 |
A23L1/221;C07D;C07D309/32;C07D309/38;C07D309/40;C11B9/00;(IPC1-7):C07D309/40 |
主分类号 |
A23L1/221 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|