Catalytic Enantioselective Nazarov Cyclization: Construction of Vicinal All-Carbon-Atom Quaternary Stereocenters
作者:Anais Jolit、Patrick M. Walleser、Glenn P. A. Yap、Marcus A. Tius
DOI:10.1002/anie.201403587
日期:2014.6.10
The diastereoselective asymmetric synthesis of vicinal all‐carbon‐atom quaternarystereocenters is a challenging problem in organic synthesis for which only few solutions have been described. A catalytic asymmetric Nazarovcyclization of fully substituted dienones that provides cyclopentenone derivatives with vicinalquaternarystereocenters in high optical purity and as single diastereoisomers is
The invention relates to 2-,5-,6-,7-,8-substituted oct-2-en-4-ones, to a process for delivering these compounds as a fragrance, an aroma, or a flavoring, and to fragrance and aroma compositions prepared therewith.
Disclosed is a compound represented by the formula (1) below which has a high DPP-IV inhibitory activity and is improved in safety, toxicity and the like. Also disclosed is a prodrug of such a compound and pharmaceutically acceptable salts of them.
(In the formula, R
1
represents a hydrogen atom, an optionally substituted alkyl group or the like; R
2
and R
3
independently represent a hydrogen atom, an optionally substituted alkyl group or the like; R
4
and R
5
independently represent a hydrogen atom, an optionally substituted alkyl group or the like: R
6
represents a hydrogen atom, an optionally substituted aryl group or the like; and —Y—NH
2
, represents a group represented by the following formula (A):
(wherein m is 0, 1 or 2; and R
7
may not exist or one or two R
7
may exist and independently represent an optionally substituted alkyl group or the like) or the like.]
Die Erfindung betrifft 2-,5-,6-,7-,8-substituierte Oct-2-en-4-one, die Verwendung dieser Verbindungen als Riechstoffe oder Geschmacksstoffe sowie die damit hergestellten Riechstoff- oder Aromakompositionen.