Table 2.

Syntheses of Esters Listed in Figure 2 under 6^a

entry	RCOOR’ 12	GC yield of ester (%)	isolated yield of ester (%)	reaction condition
1	12a	99	95	catalyst 1 mol%, 80 °C, 5 h
2	12b	97	83	catalyst 1 mol%, 80 °C, 6 h
3	12c	70	61	catalyst 1 mol%, 80 °C, 30 h
4	12d	78	76	catalyst 5 mol%, 25 °C, 24 h
5	12e	99	93	catalyst 1 mol%, reflux, 16 h
6	12f	81	81	catalyst 1 mol%, 2 eq. acid, reflux, 30 h
7	12g	92	83	catalyst 1 mol%, 2 eq. acid, reflux, 48 h
8	12h	55	59	catalyst 10 mol%, reflux, 96 h
9	12i	61	50	catalyst 1 mol%, reflux, 48 h
10	12j	40	33	catalyst 10 mol%, reflux, 144 h
11	12k	99	93	catalyst 1 mol%, reflux, 96 h
12	12l	74	64	catalyst 10 mol%, reflux, 40 h
13	12m	84	78	catalyst 10 mol%, 2 eq. alcohol, reflux, 48 h

^aUnless otherwise noted, an acid (2 mmol), an alcohol (2 mmol) in isooctane (4 mL).