Transformations of penicillin. Part II. NN′-Di-isopropyihylrazine, a new reagent for protection of carboxylic acids
作者:D. H. R. Barton、M. Girijavallabhan、P. G. Sammes
DOI:10.1039/p19720000929
日期:——
NN′-Di-isopropylhydrazine is a useful reagent for the protection of carboxylic acids. The derived hydrazides can be reconverted by selective oxidation, with, for example, lead tetra-acetate, into the parent acids in very high yield. The protecting group has been used for penicillins. Acid-catalysed rearrangement of the NN′-di-isopropyl-hydrazide from 6β-phenylacetamidopenicillanic acid (S)-sulphoxide
NN ' -二异丙基肼为羧酸保护的有用试剂。衍生的酰肼可以通过选择性氧化,例如用四乙酸铅,以很高的收率转化成母体酸。该保护基已用于青霉素。酸催化的重排NN ' -二异丙基-酰肼从6β-phenylacetamidopenicillanic酸(小号)-sulphoxide,其次是保护基团,得到相应的去乙酰酸的氧化裂解。6β-苯基乙酰胺基openicillanic酸(S)-亚砜的N-异丙基酰肼的热重排产生了适度的脱水青霉素。