How is (1R)-1-[(4R,4aR,8aS)-2,6-Bis(3,4-dimethylphenyl)tetrahydro[1,3]dioxino[5,4-d][1,3]dioxin-4-yl]-1,2-ethanediol (CAS: 135861-56-2) typically synthesized?

(1R)-1-[(4R,4aR,8aS)-2,6-Bis(3,4-dimethylphenyl)tetrahydro[1,3]dioxino[5,4-d][1,3]dioxin-4-yl]-1,2-ethanediol is typically synthesized via a multi-step process involving the condensation of diethyl malonate and 3,4-dimethylbenzaldehyde, followed by a series of ring-closing and functional group transformations. The synthesis involves the use of common solvents like dichloromethane, and the reaction is catalyzed by typical aromatic activation reagents. The overall yield is approximately 70-80%.