Synthetic studies related to the esperamicin/calicheamicin aglycone: efficient construction of a homochiral oxabicyclo [7 : 3 : 1] analogue fromD-xylose
Abstract The reaction of d -glucose and d -xylose with 2-methyl-2-propanethiol in conc. hydrochloric acid yielded tert-butyl 1-thioglycopyranosides (products of kinetic and thermodynamic control). Di-tert-butyl dithioacetals (12–14) were obtained from the acetylated aldehydo-derivatives of d -glucose, d -xylose, and d -erythrose. On brief treatment with conc. hydrochloric acid, 12 and 13 gave tert-butyl
Synthetic studies related to the esperamicin/calicheamicin aglycone: efficient construction of a homochiral oxabicyclo [7 : 3 : 1] analogue from<scp>D</scp>-xylose
The synthesis of a bicyclic model of the calicheamicin/esperamicin aglycone is described using a highly efficient and stereospecific Nozaki–Kishi reaction for the ring closure.