作者:Thais Nogueira、Alessandra Pinheiro、Carlos Kaiser、James Wardell、Solange Wardell、Marcus de Souza
DOI:10.2174/15701786113109990028
日期:2013.9.1
Cyclization of the (4S)-PhCH2OCONHCH(CH2OH)CONHN=CH-aryl, obtained in 4 steps from L-serine, on treatment with MeI and potassium carbonate, generates the chiral oxazolidinones, (4S)-N'-[(E)-(phenyl)methylidene]-Nmethyl- 2-oxo-1,3-oxazolidine-4-carbohydrazides. Overall the formation of the (4S)-N'-[(E)-(phenyl)methylidene]-Nmethyl- 2-oxo-1,3-oxazolidine-4-carbohydrazides from L-serine occurs with retention
从L-丝氨酸分4步获得的(4S)-PhCH 2 OCONHCH(CH 2 OH)CONHN = CH-芳基的环化反应,经MeI和碳酸钾处理,生成手性恶唑烷酮,(4S)-N'- [(E)-(苯基)亚甲基] -N甲基-2-氧代-1,3-恶唑烷-4-碳酰肼。如所证实的,总体上,由L-丝氨酸形成(4S)-N'-[((E)-(苯基)亚甲基] -N甲基-2-氧代-1,3-恶唑烷-4-碳酰肼)并保留了构型。通过X射线晶体学。相反,在用MeI / K 2 CO 3处理时,N-Boc类似物(4S)-t-BuOCONHCH(CH 2 OH)CONHN = CH-芳基的反应仅导致N-甲基化,而没有环化且没有Boc保护基的丧失得到(4S)-t-BuOCONMeCH(CH2 OH)CONHN = CH-芳基。Boc和Cbz衍生物之间的差异是惊人的,可能与Boc基团的更大体积(阻止分子内酰基转移)有关。