K. Krohn et al., FROM SUGARS TO CARBOCYCLES .4. EXCLUSIVE 7-MEMBERED RING FORMATION FROM D-GLUCOSE, Tetrahedron : asymmetry, 5(12), 1994, pp. 2485-2492
An example of the 1,3-dithiane methodology of carbocyclization of suga
rs leading selectively to a seven-membered ring 16 is presented. The s
electivity is discussed in terms of steric hindrance of the respective
six-membered transition states.