HCID 12561488, compound → HCID 12561487, compound

Participants

Reaction Steps

In the same manner but replacing 3-acetyl-4-thiochromanone boron difluoride complex with an equivalent amount of another compound of formula V described in Example 1, the following compounds of formula VI are obtained respectively: 4-oxo-4H,5H-[1]benzothiopyrano[4,3-b]pyran-3-carboxaldehyde, mp 141°-143° C., 9-(1-methylpropyl)-4-oxo-4H,5H-[1]benzothiopyrano[4,3-b]pyran-3-carboxaldehyde, mp 94°-96° C., 9-butyl-4-oxo-4H,5H-[1]benzothiopyrano[4,3-b]pyran-3-carboxaldehyde, mp 103°-105° C., 5-methyl-4-oxo-4H,5H-[1]benzothiopyrano[4,3-b]pyran-3-carboxaldehyde, 6-chloro-4-oxo-4H,5H-[1]benzopyrano[4,3-b]pyran-3-carboxaldehyde, 5-ethyl-7-methyl-4-oxo-4H,5H-[1]benzopyrano[4,3-b]pyran-3-carboxaldehyde, 8-nitro-4-oxo-4H,5H-[1]benzothiopyrano[4,3-b]pyran-3-carboxaldehyde-1 -oxide, 10-ethoxy-5-methyl-4-oxo-4H,5H-[1]benzothiopyrano[4,3-b]pyran-3-carboxaldehyde-1,1-dioxide, 5-propyl-8-trifluoromethyl-4-oxo-4H,5H-[1]benzopyrano[4,3-b]pyran-3-carboxaldehyde, 7-bromo-5-(1-methylethyl)-4-oxo-4H,5H-[1]benzothiopyrano[4,3-b]pyran-3-carboxaldehyde, 8-butoxy-4-oxo-4H,5H-[1]benzothiopyrano[4,3-b]pyran-3-carboxaldehyde and 5-butyl-9-hexyl-4-oxo-4H,5H-[1]benzopyrano[4,3-b]pyran-3-carboxaldehyde.

Provenance & Evidence