Conjugate Addition of Phenols to 2-Nitrogalactal − Synthesis of O-(2-Acetamido-2-deoxygalactosyl)tyrosine
作者:Ahmed I. Khodair、Gottfried A. Winterfeld、Richard R. Schmidt
DOI:10.1002/ejoc.200200712
日期:2003.5
2-Nitrogalactal derivative 1 afforded 2-deoxy-2-nitrogalactopyranosides on treatment with phenol and substituted derivatives under base catalysis. Transformation of the nitro group into the amino and the acetamido groups and O-deprotection could readily be performed, thus providing aryl 2-acetamido-2-deoxygalactopyranosides 5 and 6 in high yields and with good stereoselectivities. The same reaction
2-硝基半乳醛衍生物 1 在碱催化下用苯酚和取代衍生物处理得到 2-脱氧-2-硝基半乳糖苷。可以很容易地将硝基转化为氨基和乙酰氨基和 O-脱保护,从而以高产率和良好的立体选择性提供芳基 2-乙酰氨基-2-脱氧吡喃半乳糖苷 5 和 6。同样的反应顺序也可以成功应用于 N-Boc 保护的酪氨酸甲酯,得到 O-吡喃半乳糖基酪氨酸衍生物 10。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)