Eucleanal A and B:Two new napthalene derivatives from Euclea divinorum

Two new naphthalene derivatives named eucleanal A and B（1 and 2） were isolated from Euclea divinorum.The structures of the new compounds were elucidated by detailed spectroscopic analysis such as ¹H,¹³C NMR,COSY,HMQC,HMBC and HREIMS mass spectrometry.     

Synthesis of 4-deoxyrhodomycinones with incorporation of (s)-lactic acid

The aldehydes 4 ,8a/8b and the acetals 5a/5b are prepared from the (S)-lactic acid derivative 3. Marschalk reaction with leucoquinizarine (10) affords rhodomycinones with one, two or three hydroxy groups in ring A. The 7,9- -diol 21 (6-demethoxyfeudomycinone C) is the major cyclization product of the acetonides 20a/20b.     

Progressive hedging for stochastic programs with cross-scenario inequality constraints

Computational Management Science - In this paper, we show how progressive hedging may be used to solve stochastic programming problems that involve cross-scenario inequality constraints. In...     

Pycnangloside: a new cerebroside from bark of Pycnanthus angolensis

Pycnanthus anglonensis is known for its medicinal value. This paper deals with a phytochemical investigation of this species, from which pycnangloside (1), a new cerebroside has been isolated. Its structure was determined by comprehensive analyses of its 1D and 2D NMR spectroscopic, and ESI mass spectrometric data. Four known compounds were also isolated and identified as biochanin A, formonentin, beta-sitosterol, and beta-sitosterol glucopyranoside.