Disclosed is a direct acid catalyzed intermolecular electrocyclic rearrangement process for the preparation of linear and cyclic homoallylic ester and amides.
本发明揭示了一种直接酸催化的分子间电环重排过程,用于制备线性和环状同烯基酯和酰胺。
NOVEL PROCESS
申请人:Givaudan S.A.
公开号:US20140288326A1
公开(公告)日:2014-09-25
A direct acid catalyzed intermolecular electrocyclic rearrangement process for the preparation of linear and cyclic homoallylic ester and amides. A one step intermolecular electrocyclic rearrangement process includes the step of reacting a beta, gamma-unsaturated aldehyde or ketone, in which the beta, gamma-unsaturation is not part of an aromatic ring, with another aldehyde or a secondary aldimine in the presence of an acid.
One-step intermolecular electrocyclic rearrangement process
申请人:Givaudan S.A.
公开号:US09371262B2
公开(公告)日:2016-06-21
A direct acid catalyzed intermolecular electrocyclic rearrangement process for the preparation of linear and cyclic homoallylic ester and amides. A one step intermolecular electrocyclic rearrangement process includes the step of reacting a beta, gamma-unsaturated aldehyde or ketone, in which the beta, gamma-unsaturation is not part of an aromatic ring, with another aldehyde or a secondary aldimine in the presence of an acid.
Conceptually different: This allyltransfer reaction is catalyzed by Lewis acids (LAs) and proceeds atom‐economically by disproportionation of the carbonyl groups through organized oxonia‐Cope transition states (see scheme). A stereoselective [n+4] ring enlargement leads to a variety of macrolides with 9‐ to 16‐membered rings.
概念上的不同:烯丙基转移反应是由路易斯酸(LAs)催化的,并且通过有组织的oxonia-Cope过渡态使羰基歧化,从而在原子经济上进行(参见方案)。立体选择的[ n +4]环扩大会生成具有9至16元环的各种大环内酯类化合物。