SQL Server 2019

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create table t (dt datetime not null primary key);
with cte as (
select cast('2020-11-13 00:00:00' as datetime) dt
union all
select dateadd(minute,1,cte.dt) dt
from cte
where dt < '2020-11-13 23:59:00'
)
insert into t
select * from cte
option (maxrecursion 0)
1440 rows affected

with cte as (
	select
		*
		,row_number()over(partition by format(dt, 'yyyy\-MM\-dd\-HH') order by dt) as rn1
		,row_number()over(partition by format(dt, 'yyyy\-MM\-dd\-HH') order by dt desc) as rn2
	from t )
select dt from cte where rn1 = 1 or rn2 = 1 order by dt;

dt

2020-11-13 00:00:00.000

2020-11-13 00:59:00.000

2020-11-13 01:00:00.000

2020-11-13 01:59:00.000

2020-11-13 02:00:00.000

2020-11-13 02:59:00.000

2020-11-13 03:00:00.000

2020-11-13 03:59:00.000

2020-11-13 04:00:00.000

2020-11-13 04:59:00.000

2020-11-13 05:00:00.000

2020-11-13 05:59:00.000

2020-11-13 06:00:00.000

2020-11-13 06:59:00.000

2020-11-13 07:00:00.000

2020-11-13 07:59:00.000

2020-11-13 08:00:00.000

2020-11-13 08:59:00.000

2020-11-13 09:00:00.000

2020-11-13 09:59:00.000

2020-11-13 10:00:00.000

2020-11-13 10:59:00.000

2020-11-13 11:00:00.000

2020-11-13 11:59:00.000

2020-11-13 12:00:00.000

2020-11-13 12:59:00.000

2020-11-13 13:00:00.000

2020-11-13 13:59:00.000

2020-11-13 14:00:00.000

2020-11-13 14:59:00.000

2020-11-13 15:00:00.000

2020-11-13 15:59:00.000

2020-11-13 16:00:00.000

2020-11-13 16:59:00.000

2020-11-13 17:00:00.000

2020-11-13 17:59:00.000

2020-11-13 18:00:00.000

2020-11-13 18:59:00.000

2020-11-13 19:00:00.000

2020-11-13 19:59:00.000

2020-11-13 20:00:00.000

2020-11-13 20:59:00.000

2020-11-13 21:00:00.000

2020-11-13 21:59:00.000

2020-11-13 22:00:00.000

2020-11-13 22:59:00.000

2020-11-13 23:00:00.000

2020-11-13 23:59:00.000