Asymmetric Synthesis of α-Branched Primary Amines on Solid Support via Novel Hydrazine Resins
作者:Dieter Enders、Jan H. Kirchhoff、Johannes Köbberling、Thomas H. Peiffer
DOI:10.1021/ol015721x
日期:2001.4.1
[reaction: see text]. Two novel chiral hydrazine resins for asymmetric solid-phase synthesis have been developed. The enantiopure beta-methoxyamino auxiliaries, derived from trans-4-hydroxy-(S)-proline and (R)-leucine, were attached to Merrifield resin and transformed into their corresponding hydrazines. Immobilization of various aldehydes, followed by 1,2-addition of organolithium reagents to the
[反应:请参见文字]。已经开发出两种用于不对称固相合成的新型手性肼树脂。源自反式-4-羟基-(S)-脯氨酸和(R)-亮氨酸的对映体纯β-甲氧基氨基助剂与Merrifield树脂连接,并转化为其相应的肼。固定各种醛,然后将1,2,2-有机锂试剂加到生成的对映体纯hydr中,并从固体载体上还原性裂解,得到α-支化胺,将其分离为相应的酰胺,总收率高,对映体过量达到86%。