Transannular cyclizations of germacrone-4,5-epoxide under acidic and thermal conditions have been reported in our previous study. However, this process gave the different and interesting results under basic conditions. (4S,5S)-Germacrone-4,5-epoxide (1) was treated under basic conditions to yield four products (2-5). Compound 2 was an isomer of 1--(4S,5S,9Z)-4,5-epoxygermacra-7(11),9-dien-8-one...

The conformational analysis of the synthetic peptide (formula, see text) has been carried out, as a model for small disulfide loops, in biologically active polypeptides. 1H NMR studies (270 MHz) establish that the Val(3) and Cys(4) NH groups are solvent shielded, while 13C studies establish an all-trans peptide backbone. Circular dichroism and Raman spectroscopy provide evidence for a right-han...

BACKGROUND The management of neonates with symptomatic tetralogy of Fallot (TOF) requiring surgical intervention in the first month of life remains controversial. We reviewed our experience with neonates 30 days or greater with TOF from 2002 to 2008 requiring surgical intervention. METHODS Thirty-seven consecutive symptomatic nonrandomized neonates with TOF or its variants (including TOF with...