Jf. Pilard et al., INTRAMOLECULAR [4- A USEFUL ENTRY TO PHOSPHABICYCLO[4.3.0]NON-4-ENE DERIVATIVES(2] CYCLOADDITIONS INVOLVING TRANSIENT PHOSPHAALKENE INTERMEDIATES AS DIENOPHILES ), Chemical communications, (4), 1998, pp. 457-458
Three representative phosphabicyclo[4,3,0]non-4-ene derivatives are fo
rmed in high yields and various diastereomeric forms by [4 + 2] intram
olecular cycloadditions involving transient phosphaalkenes as dienophi
les; complete diastereoselectivity is observed with the P-substituted
derivative.