= 1 2-ClC6H4 a 4-pyridyl i 2-lhimyl 1" W10 Ch “-* b 2-thienyl e 2-() 2NC,, H,, c 2-furyl ln the above manner. aldehyde 2 (R1= H) and compound I (R2= H) afforded imine 9 (Table 1). The latter was sub sequently reacted, at ambient temperature, in eg tetrahydrofuran,'with a base eg n-butyllithium, sodium hydride or potassium r-butoxide. Anion 10 thus generated was converted as it was formed into anion lil to which aldehyde 5 was in turn added to yield Z-.: ...