Chiral 2-(?-Aminoalkyl)-oxazolines by ring transformation of lactam derivatives
摘要:
2-(omega-Aminoalkyl)-oxazolines 7 as starting materials for further asymmetric synthesis can be prepared in enantiomerically pure form by ring transformation of lactim ethers 1 or lactam acetals 2 with chiral 2-aminoalcohols 3. Hydroxyethyllactam imines 5, lactamimino-alkyloxazolines 8, or omega-aminoalkaneamides 9 can be formed as by-products by condensation without ring transformation, by further reaction with lactim ether 1, or by hydrolysis, respectively.