作者:L. L. Frolova、L. V. Bezuglaya、I. N. Alekseev、P. A. Slepukhin、A. V. Kuchin
DOI:10.1007/s10600-014-0984-y
日期:2014.7
2α-Bromo,10β-pinanone-3 and 3α-bromo,10β-pinanone-4 were formed with 92–98% selectivity by bromination of isopinocamphone and cis-verbanone with Meldrum’s acid dibromide. 3α-Bromo, 10β-pinanone-4 was prepared for the first time. Its structure was confirmed by an XSA. Bromination of menthone by Meldrum’s acid dibromide formed mainly a mixture of diastereomeric 2-bromomenthones in a 2:1 ratio. Oxidative bromination of isopinocampheol by Ce(III)–LiBr–H2O2 caused rearrangement of the pinane structure into bornane and formed a mixture of 6-endo- and 6-exo-bromocamphor in a 5:1 ratio.
2α-溴,10β-松油酮-3和3α-溴,10β-松油酮-4通过用Meldrum酸二溴化物对异松油酮和顺式-桉叶油酮进行溴化形成,选择性为92–98%。3α-溴,10β-松油酮-4是首次制备的。其结构通过XSA得到确认。Meldrum酸二溴化物对薄荷酮进行溴化主要形成比例为2:1的二种对映体2-溴薄荷酮的混合物。Ce(III)-LiBr-H2O2对异松油醇进行氧化溴化导致松油环结构重组为冰片烷,并形成比例为5:1的6-内-和6-外-溴樟脑的混合物。